Their friendship is sometime referred by the the fan-given nickname Jill (taken from Jay and Will).
Jay expresses extreme hate towards Will and often attempts to degrade and humiliate him with hurtful insults and comments. Jay seldom calls Will by his name, only insults such as "you bellend" and "Count Spacula". Will also dislikes Jay back and never fails to tear apart his hollow sexual boasts. However, in the Movie, Jay refers to a wasted Will as "mate" and then puts his arm around him rather than let him sleep on an ant hill.